Types.Waveval t : t Ctypes.structure Ctypes_static.typval frame_count : (Unsigned.uint, t Ctypes.structure) Ctypes_static.fieldval sample_rate : (Unsigned.uint, t Ctypes.structure) Ctypes_static.fieldval sample_size : (Unsigned.uint, t Ctypes.structure) Ctypes_static.fieldval channels : (Unsigned.uint, t Ctypes.structure) Ctypes_static.fieldval data : (unit Ctypes_static.ptr, t Ctypes.structure) Ctypes_static.field